Now, say you just got a hat that you really want to paint to make it your own. You go to the Mann Co. Store, and decide that you will buy Mann Co. Orange, because orange is your favorite color! So you open your bags, click the paint and hit Use With, select the hat, and...

...find out it looks absolutely terrible.

I've definitely been in this situation before, and I know others possibly have been as well. How difficult might it be to implement a preview window in the Mann Co. Store, so we can get a look at what our hats look like with a selected color before we buy it?